code: def validate_filepath(self):
      if not self.exists:
          raise MissingParamsFile(
              f"Parameters file '{self}' does not exist"
          )
      if self.isdir():
          raise ParamsIsADirectoryError(
              f"'{self}' is a directory, expected a parameters file"
          )
  
imports: import os
  import typing
  from collections import defaultdict
  from typing import TYPE_CHECKING, Any, Dict, List, Optional
  import dpath
  from dvc.exceptions import DvcException
  from dvc.log import logger
  from dvc.utils.serialize import ParseError, load_path
  from dvc_data.hashfile.hash_info import HashInfo
  from .base import Dependency
label_desc: Use image node_id 7 for calling the ParamsDependency obj's underlying member method code with example usage: obj.validate_filepath() without return types